Device for preventing offset in printing-presses



A. B. BECK. DEVICE FOR PREVENTlNG OFFSET IN PRINTING PRESSES. APPLICATION FILED JULY 3!,1919. 1,336,995, Eatemed Apr. 13, 19%" 2 SHEETSSHEET 1.

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A. B. BECK. DEVlCE FOR PREVENTING OFFSET H 1 PRINTING PRES-SE8.

APFLIC TEUH HLED JULY 31, 19I9.

UNITED STATES PATEN T OFFICE.

ALLEN B. BECK, OF CLEVELAND, OHIO.

DEVICE FOR PREVENTING GFFSET IN PRINTING-PRESSES.

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Application filed July 31, 1919.

To all whom it may concern:

Be it known that I, ALLEN B. Bison, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Devices for Preventing Offset in Printing-Presses, of which the following is a specification.

This invention relates to an improved type of device used to prevent offset of the printed sheets of paper upon their discharge from the printing rolls of the presses.

The principal objects of the invention are in the provision of means which will prevent smudging of the printed surfaces on multiple impression presses, by removing from the sheets any traces of static electricity with which they are charged at the time of printing, and which, by its removal from the sheets of static electricity, allows the air to reach them quickly thus providing for a quick drying of the ink.

Still further objects of the invention are in the provision of a device which may be readily attached to any type of cylinder press without material changes having to be made therein, one which will be cheap of manufacture and of maintenance, eflicient and durable in operation and one which will not impair the efiiciency of the other operating parts of the press.

In the accompanying drawings I have shown a specific type of device which accomplishes the above set forth results in a convenient and expeditious manner.

Referring to the. drawings in which like reference numerals designate similar parts of reference throughout the various views, Figure l is a diagrammatic illustration of one type of press with my invention applied thereto; Fig. 2 is a plan view thereof; Fig. 3 is a central section through the roll which forms the principal part of this invention; Fig. 4 is a transverse section therethrough and Fig. 5 is a sectional detail on the line 5-5 of Fig. 2 illustrating the supporting means for the roll indicated in Fig. 3.

As illustrated in Fig. 1 the device is shown applied to that type of press known to the trade as a. Kelly press and comprising an impression roll 1 supported by any suitable frame work, not shown, the feeding table 2 on which the sheets of paper are carried beneath the roll are also supported within suitable frame work, and a guide way 3 upon the top of which reciprocates a Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 314,473.

type block Behind the roll and above the aforementioned guide way 3 is supported a receiving box which is commonly called a jogger box, and between the box 5 and the roll 1 a series of endless belts or tapes 6 guide the paper from the point where it is stripped from the roll by the stripping fingers 7 beneath the guide wire 8 where it is carried into the jogger box. My improved roll is placed and suitably supported in brackets between the impression cylinder and the jogger box 5 as indicated generally at 10 in F ig. 1. The roll is located preferably just in front of saidjogger box and is supported by the aforesaid brackets which are fixed to the shaft upon which the rollers for the endless belts or tapes 6 are mounted, thus the paper previous to passing into the jogger box is compelled to pass over the top surface of the roller. This roll may be supported at any convenient place between the point at which the paper leaves the impression roll of the press and the jogger box and does not necessarily have to be placed in the position shown, the same being illustrated herein only for the purpose of clearly illustrating the invention.

The roll which forms the subject matter of this invention consists of a metal tube 20 having threaded into each end plugs or bushings 21 and 22, the one indicated at 21 having provided at. its outside portion with a short stub shaft 23 which is mounted within a suitable bearing 24:. to be hereinafter described. The plug 22 is provided immediately outside that portion, which threads into the tube with a grooved pulley 25 which receives a belt 26 for driving purposes, this plug having likewise provided thereon a stub shaft 27 which is mounted within a bearing bracket 28. The interior of the roll 20 is adapted to be filled with any absorbent material and which is later thoroughly saturated with glycerin, the glycerin being allowed to flow outwardly through the tube by a plurality of radial apertures 29 to thoroughly saturate a felt or like covering 30 which is wrapped about the periphery of the roll. The roll is supported in the ends of the aforementioned brackets 24 and 28 and these brackets may be fixed to any convenient part of the press, here shown as affixed to the shaft 31 on which the pulleys of the guide tapes 6 are mounted. The roll is driven by means of the aforementioned belt 26 from the driving shaft 32 which is suitably geared to the impression cylinder of the press.

It is a well known fact that glycerin if applied to the surface of the impression roll will entirely remove all static electricity from the printed sheets, but the objection in this case is that it entails considerable loss of the printers time in renewing the application thereon, and to provide a means whereby the glycerin may be applied to the printed sheets for a continued period of time, the roller before described has been devised.

It will be readily seen that as the paper passes over and above the roller the action of the glycerin is the same as that acquired when it is applied to the impression rollers and due to the fact that a reserve supply of glycerin is continually being carried to the absorbent felt on the outside of the roll, it will be found unnecessary to replenish the roller only when the press has been used for a long time. By the removal of the static electricity the sheets of paper are prevented from adhering to one another when they enter the jogger box thereby allowing the box to perform its function in thoroughly lining up the printed sheets and this lining up of sheets has been impossible to obtain previous to the use of this device due to the aforestated fact that a certain adherence of the sheets was caused by the presence of static electricity; furthermore the removal of this static electricity and consequent adherence of the sheets allows air to enter upon the printed surface thereof which provides for a quick and thorough drying of the ink, which is a feature of advantage and which will be readily appreciated when multi-color work is being done.

Vhile I have shown this specific form of device it is obvious that numerous modifications may be obtained by those familiar with the art and I do not purpose to be limited further than is required by the state of the art and that which comes within the scope of the appended claims.

I claim:

1. The combination with a printing mechanism, of a roller over which the printed sheets pass from said mechanism, said roller being provided with means to remove static electric charges from said sheets.

2. The combination with a printing mechanism, of a roller over which the printed sheets pass from said mechanism, said roller being provided with means to apply an oily medium to said sheets as they pass thereover.

3. The combination with a printing mechanism, of a roller over which the printed sheets pass from said mecl'ianism, said roller being provided with means to apply glycerin to said sheets as they pass thereover.

4. The combination with a printing mechanism, of a roller over which the printed sheets pass from said mechanism, said roller being hollow and provided with a filling of oily material, and openings through which said oily material may escape to the surface of the roller, whereby to apply said material to the sheets as they pass thereover.

5. The combination with the impression mechanism and receiving box of a printing press, of a roller located between said mechanisin and box, over which the printed sheets pass from the former to the latter, said roller being provided with means to apply an oily substance to the sheets.

6. The combination with the delivery tapes of a printing press, of a roller over which the sheets pass from said tapes, said roller being provided with means to apply an oily substance to said sheets.

In testimony whereof, I athx my signature in presence of two witnesses.

ALLEN B. BECK.

Witnesses:

JOHN A. BouMHARn'r, EUGENE A. OANNING. 

